what does the IMAP do ? I know this is almost similar like pop3 protocol, but difference is when pop3 is used, mail from server got downloaded. but in case of IMAP, a copy still remain on the server... (??? really
?). But i think this is not the main difference.
If I want to install a mail server with postfix. Do i both need to have pop3 and IMAP running on the server ? or I can use SMTP with IMAP.